By ETonline Staff
1:16 PM PDT, April 20, 2021
How far will actors go to look the part?
Christian Bale

The Oscar winner is no stranger to big transformations! On April 18, 2021, the actor was spotted with a completely bald head while in Sydney, Australia, where he was filming Thor: Love and Thunder and portraying Gorr the God Butcher.
Christian Bale

The Oscar winner looked nearly unrecognizable on Sept. 4, 2017, at the Telluride Film Festival in Colorado, after packing on the pounds to portray former Vice President Dick Cheney in Backseat.
Jake Gyllenhaal

The Prince Of Persia certainly came down a few pounds! Jake Gyllenhaal underwent a dramatic weight loss for his role in the 2014 film Nightcrawler. The movie, also starring the late Bill Paxton and Renee Russo, is about a young man who stumbles upon the underground world of Los Angeles' freelance crime journalism. Gyllenhaal told Us Weekly of his character, Lou, a freelance reporter, "I knew that [Lou] was literally and figuratively hungry."
That being said, the actor revealed he went into a mode where he too was "always a bit hungry."
Russell Crowe

Christian Bale

Renee Zellweger

50 Cent

Jared Leto

Matt Damon

Mila Kunis

Natalie Portman

Anne Hathaway

Matthew McConaughey

Jared Leto

Chris Pratt

"I've always been a little soft, I like to eat and I don't like crunches. I had about five or six months and I really busted my ass to get in good shape," Pratt said before showing the photo on the left to Conan O'Brien.
But, the actor's abs were short-lived as he revealed, "Almost immediately after I wrapped that movie, I gained 60 pounds to play a role in another movie. I'm kind of like a fatass [now]. I have a little extra belly going on."